基于不同制备方法的淤泥基流态固化土试验研究

Experimental study of silt-based fluid solidified soil based on different preparation methods

中文关键词: 淤泥  流态固化土  萘系减水剂  脂肪族减水剂  聚羧酸系减水剂  性价比

英文关键词: silt  fluid solidified soil  naphthalene series superplasticizer  aliphatic series superplasticizer  polycarboxylic acid series superplasticizer  cost-performance ratio

中文摘要:

      淤泥颗粒细，比表面积大，为了将淤泥制成流态固化土，一般有加入减水剂和提高淤泥含水率(同时改变固化剂掺量)两种方法．为了比较两者差异，对于提高含水率法，研究了含水率为80%~140%、固化剂掺量为3%~7%条件下，流态固化土的流动与强度特性；对于减水剂法，分别采用萘系减水剂(FDN)、脂肪族减水剂(AS)、聚羧酸系减水剂(PC-H2)3种不同分散机理的减水剂，结合液塑限、粒径曲线、SEM试验分析了不同减水剂对流态固化土的作用机理．结合流动度与无侧限抗压强度评价其工作性能，并进行成本估算，比较两种制备方法的性价比．研究表明，减水剂法相比提高含水率法能显著提升流态固化土的工作性能；提高含水率法成本最低，减水剂法中PC-H2的性价比最高，AS与FDN性价比接近，建议在不影响工程质量的前提下，使用提高含水率法制备流态固化土．

英文摘要:

      The silt particles are fine and the specific surface area is large. In order to make the silt into fluid solidified soil, there are generally two methods: adding water\|reducing agent and increasing the moisture content of the silt (while changing the dosage of curing agent). In order to compare the difference between the two methods, the flow and strength characteristics of the fluid solidified soil are studied for increasing moisture content method under the condition that the water content is from 80% to 140% and the curing agent dosage is from 3% to 7%. As for the water\|reducing agent method, three kinds of superplasticizers with different dispersion mechanism, namely naphthalene series superplasticizer (FDN), aliphatic series superplasticizer (AS) and polycarboxylic acid series superplasticizer (PC\|H2), are used to analyze the action mechanism of different superplasticizers on fluid solidified soil by combining liquid limit and plastic limit, particle size curve and SEM test. The working performance is evaluated by combining the fluidity and unconfined compressive strength, and the cost estimation is carried out to compare the cost\|performance ratios of the two preparation methods. The results show that the water\|reducing agent method can significantly improve the working performance of fluid solidified soil compared with the method of increasing moisture content. The cost of increasing moisture content method is the lowest, and the cost\|performance ratio of PC\|H2 is the highest in the water\|reducing agent method. The cost\|performance ratio of AS is close to that of FDN. It is suggested that increasing moisture content method should be used to prepare fluid solidified soil under the premise of not affecting project quality.